CMAJ • March 31, 2009; 180 (7). doi:10.1503/cmaj.080966.
© 2009 Canadian Medical Association or its licensors
All editorial matter in CMAJ represents the opinions of the authors and not necessarily those of the Canadian Medical Association.
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Effect of school-based physical activity interventions on body mass index in children: a meta-analysis

Kevin C. Harris, MD, Lisa K. Kuramoto, MSc, Michael Schulzer, MD PhD and Jennifer E. Retallack, MD

From the Department of Pediatrics (Harris, Retallack), BC Children's Hospital; and the Centre for Clinical Epidemiology and Evaluation (Kuramoto, Schulzer), Vancouver General Hospital, Vancouver, BC


Figure 119
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  		Figure 1: Weighted mean difference in change in body mass index (BMI) between the intervention group (school-based physical activity) and the control group. The size of each data marker indicates the weight assigned to the individual study. These weights are proportional to the inverse of the variance for each study. Larger studies tend to have less variance (because of sample size) and therefore receive more weight. Note: CI = confidence interval.

 

Figure 219
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  		Figure 2: Sensitivity analysis for weighted mean difference in change in body mass index (BMI) between the intervention group (school-based physical activity) and the control group. Note: CI = confidence interval.

 

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  		Table 1.